Finding the Fourth Proportional to 2,160.17, 2,981.15 and 1,216.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.17 : 2,981.15 = 1,216.26 : x
2. Step 2: Convert to fraction form
   2,160.17/2,981.15 = 1,216.26/x
3. Step 3: Cross multiply
   2,160.17x = 2,981.15 × 1,216.26
4. Step 4: Simplify right side
   2,160.17x = 3,625,847.42
5. Step 5: Solve for x
   x = 3,625,847.42/2,160.17
6. Step 6: Final answer
   x = 1,678.50